新加坡国立大学的量子科学家创造出最为先进的无缺陷原子阵列
指南者留学
2023-05-11 16:37:30
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<p style="margin: 0px; padding: 0px; box-sizing: border-box;"><span style="box-sizing: border-box;">▲</span><span style="box-sizing: border-box;">中性原子阵列是一个极具发展前景的量子模拟平台。罗睆倩助理教授与她所在的研究团队可以精确捕获单个铷原子,并将其排列组成大型阵列。此外,还可以将其排列成任何图案:(从左到右)kagome,honeycomb以及lion head。右边的狮头标识图像是新加坡的国家象征。</span></p>
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<p style="margin: 0px; padding: 0px; box-sizing: border-box;">新加坡国立大学量子科技研究中心(CQT)的研究人员开发出一种新方法:<span style="color: #003d7c; box-sizing: border-box;"><strong style="box-sizing: border-box;">利用光学镊子(Optical Tweezers)将铷原子原始地排列成大约与人的头发一样宽的阵列。</strong></span>由新加坡国立大学量子科技研究中心主要研究员罗睆倩(Loh Huanqian)助理教授领导的团队使用由一种新型算法驱动的自动化装置,实现了一个无缺陷的225原子阵列,成功概率为33%——<span style="color: #003d7c; box-sizing: border-box;"><strong style="box-sizing: border-box;">这是室温设置文献报道的最高成功概率之一。</strong></span></p>
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<p style="margin: 0px; padding: 0px; box-sizing: border-box;"><span style="color: #003d7c; box-sizing: border-box;"><strong style="box-sizing: border-box;">量子阵列可以帮助科学家对材料进行强大的量子模拟。</strong></span>“完美的图案”是至关重要的,因为已发现阵列中的缺陷或原子缺失会降低量子模拟中观察到的信号。</p>
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<p style="margin: 0px; padding: 0px; box-sizing: border-box;">来自新加坡国立大学量子科技研究中心的研究团队通过使用几个光学镊子重新排列多个原子以实现这一目标,使其比使用单个光学镊子——<span style="color: #003d7c; box-sizing: border-box;"><strong style="box-sizing: border-box;">一次只移动一个原子的现有方法更加高效与完美。</strong></span></p>
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<p style="margin: 0px; padding: 0px; box-sizing: border-box;">据该研究论文的第一作者、新加坡国立大学量子科技研究中心的博士生田威坤(Tian Weikun)所说,<span style="color: #003d7c; box-sizing: border-box;"><strong style="box-sizing: border-box;">“一次只重新排列一个原子”就像只用一根手指打字。</strong></span>他指出:“我们的新方法可以一次重新排列多个原子,类似于用多根手指同时打字,速度更快,也更节省时间。”此外,由于原子不会永远停留在原位,模拟重新排列原子的速度越快,产生缺陷的可能性就越低。</p>
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<p style="margin: 0px; padding: 0px; box-sizing: border-box;"><span style="box-sizing: border-box;">该团队的研究人员展示了他们的研究方法,可以将原子阵列排列成任意几何形状,例如honeycomb、kagome和link-kagome——</span><span style="color: #003d7c; box-sizing: border-box;"><strong style="box-sizing: border-box;">这对于研究石墨烯、超导体或量子自旋液体等不同的先进材料具有十分重要的作用。</strong></span></p>
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<p style="margin: 0px; padding: 0px; box-sizing: border-box;">罗睆倩助理教授表示:“为了彰显出我们在新加坡做到了这一点,我们还重新排列了单原子,以形成lion head狮头标识图像。”<span style="color: #003d7c; box-sizing: border-box;"><strong style="box-sizing: border-box;">狮头图像在1986年被采纳作为新加坡的国家标志,象征着勇气、力量与优秀。</strong></span></p>
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